JPS59124247A - Method and device for inspecting defective vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (I) Background of the Invention Technical Field The present invention relates to a method for inspecting containers for containing electrically conductive contents, such as liquids such as Ringer's solution and infusion preparations, or amorphous contents such as foods. and inspection equipment.

Prior Art When a container is sandwiched between two electrodes and an attempt is made to inspect almost the entire surface of the container, air moves above the container and becomes an obstacle to the inspection. 1. To solve this problem, Japanese Patent Application Laid-Open No. 53-3208
No. 4 discloses an invention in which a glass ampoule to be inspected is rotated and air is moved to conduct a thorough inspection. However, since it relies on two screw rolls rotating in the same direction for air movement, it is suitable for fixed-sized hard containers such as ampoules and bottles. however,
In the case of containers made of soft resin that contain easily deformed objects or irregularly shaped liquids and fluids, such as Ringer's solution and infusions, transportation becomes difficult. Furthermore, due to the characteristics of the liquid and fluid contained inside the container, it is virtually impossible to flatten the container and turn it over. Therefore, defect inspection of flat, amorphous containers containing amorphous contents such as liquids and fluids has been extremely insufficient.

(II) Purpose of the Invention The present invention is proposed in view of the disadvantages of the prior art, and its main purpose is to propose a method and device for inspecting irregularly shaped containers for containing fluid. .

Further, the present invention proposes a method and apparatus for inspecting defects in irregularly shaped containers containing fluid that is flattened. The purpose of this shout is to set a first electrode on a dielectric container containing an amorphous conductive content and gas, and to place the container and the content between the first electrode and the dielectric container. In an inspection method for inspecting a container for defects while moving it on a conveyance path, the conveyance path is tilted in one direction and the inspection surface of the container after gas movement is configuring a closed circuit, inspecting the inspection surface, then tilting the conveying path in a direction opposite to the one direction to move the gas, and configuring the closed circuit before inspecting the container after the gas has been transferred. This is accomplished by an inspection method that inspects containers for defects. In the inspection, the inspection surface on the container is moved by the movement of the container conveyed along the conveyance path which is preferably selectively tilted in two directions, and as the inspection surface on the container is substantially inspected after the gas movement is completed, the conveyance The slope of the path is reversed and the gas is moved to the area where the inspection has been completed.

Another object of the present invention is to provide a first electrode installed on at least one surface of the container in order to electrically detect defects in a container made of a dielectric material containing amorphous conductive contents and gas. , a second electrode provided to form a closed circuit between the first electrode and the container via the container and the contents, and a gas existing between the fluid in the container and the container. This is achieved by a container defect inspection apparatus characterized by comprising a conveying means for moving the container in a non-inspection direction while conveying the container.

Preferably in the device the conveying means is configured to have a selective inclination in two directions.

(lit) Detailed description of the invention Examples of the present invention will be described in detail below.

In FIG. 1 showing the conceptual configuration of an embodiment of the present invention,
1 is a conductive infusion bag made of a dielectric material such as polypropylene and containing Ringer's solution 2, for example. Reference numeral 3 designates a conveyance roller section, among which a plurality of conveyance rollers are driven by a drive source (not shown) to convey the infusion bag 1 in the direction of the arrow in the figure, the other rollers except for the insulated rollers 3b and 3C are It is a conductive roller. 5 and 6 are approximately 3 to 5 II in the entire width of the upper and lower surfaces of the infusion bag 1.
A plurality of pin electrodes are in sliding contact with each other at intervals of 1 m.

Reference numeral 7 denotes an air cylinder, which urges the arm 8 clockwise or counterclockwise about the fulcrum 9 to hold the conveyance roller section 3 in two stable positions, upward to the left or upward to the right. As a result, the air lO in the infusion bag 1 moves to the top or bottom of the infusion bag, as shown.

In the above configuration, the pin electrodes 5.6 facing from the top and bottom surfaces of the infusion bag 1 are made of a dielectric material.
The capacitance of the capacitor formed is small because the contact area is small. On the other hand, the contact area of the conductive rollers 3a and 3d with the infusion bag 1 is large, and the capacitance of the formed capacitor becomes large. Due to this difference in capacitance, the conductive rollers 3a and 3d are used as ground electrodes, and the electrodes 5.6
When a high frequency current is applied between the ground electrode and the ground electrode, the impedance formed by the ground electrode becomes negligible. This electrical configuration is shown in FIG. 3 and will be described in detail. In FIG. 3, R1 is the distributed resistance of the liquid between the Ringer's solution 2 through the infusion bag 1 of the electrode 6 and the ground electrode 3d. R2 is the distributed resistance of the liquid between the Ringer's solution 2 and the ground electrode via the infusion bag 1 of the electrode 6. Similarly, R4 is the distributed resistance between the earth electrode 3d and the electrode 5, and R4 is the distributed resistance between the earth electrode/pole 3a and the electrode 5.

The configuration shown in FIG. 2 is electrically shown in the circuit diagram in FIG. 3, and further shown in the isochoric circuit in FIG. 4. In Figure 3,
The capacitor C1 is formed by a conductive roller 3a serving as a ground electrode, an infusion bag l serving as a dielectric, and conductive Ringer's solution 2 inside. The capacitor C2 is formed by a conductive roller 3d serving as a ground electrode, an infusion bag 1, and Ringer's solution 2. On the other hand, a small capacitor C3 is formed by the electrode 5, the infusion bag 1 serving as a dielectric, and the liquid inside. A capacitor C, which is connected in parallel with the capacitor C3, is formed by the electrode 6, the bag l and the liquid inside. In such a configuration, the values of capacitors C3 and C4 are very small, resulting in high impedance, and the values of negative capacitors C, . . . C2 are very large, so the equivalent circuit is as shown in FIG.

If there are no defects such as pinholes or clutter on the inspection surface of the infusion hack 1, which is the inspection control, capacitor C3
, C4 has a very small capacitance, so the impedance is high, high voltage, high frequency power supply, resistor R+ ~ R4 + capacitor C3
, C4, only a dark current flows through the closed circuit formed by C4. On the other hand, if there is a defect such as a pinhole,
Flashing occurs in the defective part of the film, causing capacitor C3 or C.
The impedance component of 4 is drastically reduced, and the impedance component is almost only the resistors R+//R2 and R3//R4.

As described above, the resistances R+//Rz and R3//R4 are the resistance of a conductive liquid such as Ringer's solution 2, and therefore have a low resistance value. Therefore, when a leak occurs in the capacitor C3 or C4, the high frequency current increases. Detector 2 detects this phenomenon.
If it is detected by 0, it is possible to detect defects on two sides of the infusion bag.

Next, air 10 is sealed in the infusion bag 1 together with Ringer's solution. If the air 10 is located under the electrode 5 during the test, even if a leak occurs in the capacitors C3, C4, the current passing through the capacitors will be blocked by the high impedance of the thick air layer. That is, a closed circuit that should be formed by a power source, a resistor, and a capacitor is interrupted by the air layer. Therefore, defects such as pinholes on the air layer cannot be detected, leading to incorrect testing. Such disadvantages are overcome by the embodiments shown in FIGS. 1 and 2. Conveyance roller section 3 shown in Fig. 1
The upper left state of is the first state, and the conveyance roller part j shown in FIG.
This state is called the second state. In the first state, the infusion bag 1 is tilted upward to the left, so the air 10 moves to the upper end of the lower part of the bag, and the middle part of the infusion bag 1 except for the lower part and the right half of the bag at the mouth are conductive. The equivalent circuit shown in FIG. 5 is formed. In this state, inspect the right half of the infusion bag. Therefore, if there is a defect such as a pinhole, it can be detected correctly. Next, the examination of the right hemisphere was completed.
When the infusion hack advances to the position indicated by the arrow 11 using a detection device such as a photo ink club or a microswitch, pressurized air is supplied to the air cylinder 7 to drive the plunger. The conveyor 3 is driven counterclockwise around the fulcrum 9 by the plunger. As a result, the conveying section is in the second upward-sloping state, and the air 10 moves to the vicinity of the opening of the infusion bag l, which has already been tested. Therefore, there are no air bubbles in the lower left half of the infusion bag l.
The conditions of the equivalent circuit shown in FIG. 5 are established, and defects such as pinholes existing in this region can be detected correctly.

6 and 7 are diagrams for explaining the arrangement, shape, and operation of the pin electrode a5.6. As shown in FIG. 5, the electrodes 5 are arranged at intervals of 3 to 5 mm, and A spring 55 hooked between the pin 52 and the hook 54 of the electrode base 53 on the electrode base 51 is always biased clockwise with a predetermined spring force in FIG. Therefore, following the distance in the thickness direction of the test object passing under the electrode 5, the electrodes 5□ to 57 move up and down and come into sliding contact with the surface of the test object. Here, the electrode 51
The reason that ~57 are arranged at the predetermined distance mentioned above is that the liquid inside the infusion bag can be seen as a surface when viewed from the pin electrode, and the lines of electric force coming out from the pin electrode are spread out. It is in. Therefore, by arranging the pin electrodes at predetermined intervals, an electric field can be applied throughout the dielectric infusion bag. The electrode 5.6 is an electrode guide 56 fixed to an inspection table (not shown) in FIGS. 6 and 7.
The distance is regulated to a predetermined interval. As shown in the figure, the electrode guide 56 is inserted between the respective pin electrodes so as to sandwich the respective pin electrodes pi51 to 57.

In the above explanation, among the high voltage and high frequency waves applied to the detection circuit, the voltage refers to the voltage that does not cause discharge damage to a bag of normal thickness, and the frequency refers to the voltage of the capacitor C3 + C.
4 refers to the frequency at which sufficient current flows through the detection circuit when a leak occurs. To be more specific, the thickness of the sheet of a normal infusion bag is about 4007J4, but for example, if the thickness is poor and the thickness is 607A, it will be 55cm at a voltage of 15kV.
Of these, 24 had dielectric breakdown and were detected as defective.

Furthermore, in the above description, a mode has been described in which the defective test is performed while the electrode is in contact with the infusion bag. However, the present invention is not limited thereto, and the electrodes can be set apart from the bag surface. In this case #, since air is also present as a dielectric, the capacitor CS r C shown by the broken line
6 is formed.

Therefore, the current may be detected taking this capacitor CS r C6 into consideration.

Based on the conceptual understanding of the present invention obtained from the above explanation, a more detailed explanation will be given based on an example in which an inspection device is used in an inspection process during the manufacturing process of an infusion bag. Note that common reference numbers are given to common configurations.

The infusion bag 1 is fed from the left side in FIG. 8 by a roller. This infusion bag l is received by the examination table 62. The inspection table 62 is held at two positions, an upward left position and an upward right position, by air cylinders shown in FIGS. 1 and 2, with the fulcrum 64 as the center. Reference numeral 66 indicates a state in which the rotary lens has been rotated to the upper left position, and reference numeral 68 indicates a state in which it has been rotated to an upper right position. 70-0 to 70-6
is a rubber roll that drives the net earth which becomes the earth electrode for forming the capacitor C1. 74-1.7
4-2 is an insulating roll. An electrode 6 fixed on the inspection table faces from between these two insulating rolls so as to come into sliding contact with the lower surface of the infusion bag 1. Electrode 5 faces from the opposite side so as to substantially oppose electrode 6. 76-0 to 76-7 are net earth 7 forming capacitor C2
This is a rubber roll that drives 8. Net Earth 72. '
78 is a pulley 80. clutch 82 and bell) 84, 86
It is rotated by a drive motor (not shown) provided through the
Transport the infusion bag. 88 is the earth electrode 76-0 and 7
This is a photocoupler for detecting the transportation position of the infusion bag installed between 6-1.

Next, to explain in detail the operation of the embodiment shown in FIG.
The inspection table 62 is set upward to the left as shown in FIG. Therefore, is the infusion bulk transported by roller 60? The conveyance surface of ゛1 and the inspection table surface form a substantially continuous conveyance surface, which is convenient for conveying objects that have liquid contents and are easily broken, such as infusion bags. Infusion bag 1 transported by a net earth 72 driven by a rotating rubber roll
A closed circuit is formed by the electrodes 5 and 6 that are in sliding contact over the entire surface of the upper and lower surfaces and the net earth 72 that forms the earth electrode, and cracks, pinholes, etc. If ヲ occurs and the infusion bag does not have the normal thickness due to some reason, one or both of capacitors C3 and C4 shown in Figures 4 and 5 may be damaged due to discharge breakdown. cause a leak. The current flowing at this time may be detected by the detector 20.

Rubber roll 76-0 indicates that the inspection of both the top and bottom of the front half of the infusion bag has been completed in this way.

Detected by the photo ink cylinder installed between 76-1, air from the pressure source is supplied to the air cylinder shown in Figs. 1 and 2, drives the plunger, and moves the inspection table 62 upward to the right. move it to the state of A state equivalent to this state is shown in FIG. As can be understood from FIG. 2, the air inside the infusion bag 1 moves to the vicinity of the mouth of the bag, and the circuit conditions shown in FIG. 5 are satisfied from the middle to the bottom where the test will be performed. Therefore, if there are defects such as pinholes, cracks, or insufficient thickness on both the upper and lower surfaces of the infusion bag 1, it is possible to perform the inspection without being hindered by air. After the test has been completed, the infusion bag is placed on a transport path by rollers 90 and the like provided continuously on the test table, lifted up, and further transported towards the next work station. A defective signal detected by the inspection device is transmitted as the product is being transported, and good products and defective products are separated, and non-defective products are packaged by a packaging machine.

Although the configuration shown in FIG. 8 shows a preferred configuration, an electrode is placed in sliding contact with the infusion bag near the center of rotation of the rotating examination table by means of a spring 55 as shown in FIGS. 6 and 7. It is desirable that the tips of 5.6 come together.

In the above explanation, an embodiment in which the inspection table has a two-stable inclination has been shown, but in the present invention, an inclination that realizes the movement of the gas layer can be given to the object to be inspected at the inspection position. If so, various aspects can be adopted.

(IV) Specific Effects of the Invention As described above, according to the present invention, the quality of the container containing the amorphous conductive contents can be determined without being hindered by the high impedance of the thick air phase within the container. Can be inspected. Furthermore, according to the present invention, although the container is flattened due to the characteristics of the amorphous contents, the air layer is moved by changing the inclination of the conveyance path, so the air layer is reliably moved and inspection accuracy is improved. Therefore, according to the present invention, it is possible to prevent defective products such as pinholes, cracks, and insufficient thickness from being sent out of the production line as much as possible, thereby improving product reliability.

[Brief explanation of the drawing]

1 and tJJ2 are diagrams conceptually showing one embodiment of the present invention, FIGS. 83 and 4 are electrical equivalent circuit diagrams of the configurations shown in FIGS. 1 and 2, and FIG. Considering the characteristics from Figure 4, capacitor c,',
Fig. 1 is an electrical equivalent circuit diagram of Fig. 2 with c2 removed, Fig. 6 is a plan view showing the structure of the pin electrode with the electrode section taken out, and Fig. 7 is a side view of Fig. 6. FIG. 8 is a side view showing an inspection device according to an embodiment of the invention installed in a product manufacturing line. Here, 1... Infusion bag, 2... Ringer's solution, 3
...Conveyance roller, 5.6... Pin electrode, 8... Arm 9... Fulcrum, 72.78... Net ground. Fourth cause No. 5E Procedural amendment C'j5&1 1. Indication of the case Patent application No. 57-234160 No. 2, Title of the invention: Container defect inspection method and inspection device 3, Person making the amendment Relationship to the case Patent Applicant: 2-44-1 Hagaya, Shibuya-ku, Tokyo , - Chill Seven Co., Ltd. 4, Agent 1-11-10 Toranomon, Minato-ku, Tokyo 105 5 Date of amendment order March 29, 1988 6 Subject of amendment B Name of invention of bow glaze and drawing 7 Contents of the amendment (1) The title of the invention in the specification is amended to "container defect inspection method and inspection device." (2) The drawings are as attached.

Claims (4)

[Claims] (1) A first electrode is set in a dielectric container containing amorphous conductive contents and gas, and a closed circuit is formed between the first electrode and the container through the container and the contents. In the inspection method for inspecting a container for defects while moving it on a conveyance path, the closed circuit is formed on the inspection surface of the container after the gas has moved by tilting the conveyance path in one direction. ,
Inspecting the inspection surface, then tilting the conveying path in a direction opposite to the one direction to move the gas, and forming the closed circuit before inspecting the container after the gas has been moved to inspect the container for defects. inspection method. (2) The inspection surface on the container moves due to the movement of the container conveyed along the conveyance path selectively tilted in two directions, and with the completion of the substantial inspection of the inspection surface after the gas movement, the conveyance 2. The inspection method according to claim 1, wherein the inclination of the path is reversed and the gas is moved to the site where the inspection has been completed. (3) a first electrode installed on at least one surface of the container for electrically detecting defects in the container made of a dielectric material containing amorphous conductive contents and gas; Transporting the gas present between the fluid in the container and the container onto the electrode of S2 provided for forming a closed circuit between the container and the contents via the container and the electrode. and a conveyance means for moving the container in a non-inspection direction. (4) The container defect inspection device according to claim 3, wherein the conveying means is selectively inclined in two directions.